So, I made this very basic character in Blender and gave it a basic rig with Rigify.
I exported to Unity, fixed the import errors in bone names / connections. Also set the import to Humanoid.
When I run it with an animation from mixamo (that works fine on a mixamo humanoid), my model looks like a deformed Thanksgiving turkey.
I’m still pretty inexperienced with rigging / animation. There was one thing which may be at least partly responsible. At one stage in Blender while editing either the mesh or armature, I realised the mesh was facing backwards, so I rotated it 180 degrees. I’m not clear on whether I did anything to the armature.
I applied all transformations to the mesh before export.
Any ideas please? I would like to kill this Turkey with fire, and any video record, ASAP 
Thank you!